The world is still old school.
Grandpa dies and I go find the paper will.
I get an affidavit from a lawyer and a death certificate with a seal from the state.
I go into the bank with a bunch of papers and they figure out what to do.
There isn't a chain of trust that the state uploads a PK signed death certificate to, which in conjunction with a PK signed 'will and trust' then triggers a preexisting blockchain contract to effect the asset transfer.
This is 20 or 30 years off. Maybe 10 or 15 in China.